Sleight of Hand: This perk has no basic benefit from its counterpart on MW2. It still increase the reload time of all guns. When using the ballistic knife and crossbow this perk will keep you fighting. If used in combination with Scaveger Pro, see benefits under Tier 1, Knifing and bowing will be your new favorite style of government. The Pro Perk offers you a the same benefits as MW2. The Aim Down Sight (ADS) is quicker on all guns except snipers. This is benefitial if using a pistol with Second Chance Pro, see benefits under tier 3.
Hardened: This perk is another perk like flak jacket that is excellent but under used. It offers you something similar to an FMJ attachment from MW2. FMJ and Hardened increase your bullet penetration through walls and objects. This will not increase damage. This is common misconception. The pro perk lessents the flinch when you are being hit by enemy bullets and increase bullet damage on vehicles. If Hardened Pro is used with Flak Jacket Pro, see benefits under tier 1, you will be able to sustain hits while throwing grenades. Flak Jacket Pro and Hardened Pro offer you two different tiers of protection.
Steady Aim: This did the exact same thing as it did in MW2. It made hip firing more accurate. The way it was programed the crosshair's size are decreased when using Steady Aim. This by default makes hip firing more accurate. When used with Sleight of Hand Pro, see benefits under tier 1, not only are the crosshairs smaller make ADS, by nature, faster, but the quicker ADS benefit from Sleight of Hand will make your ADS extremly fast.
Warlord: Similar to Bling from MW2 you are allowed two attachments to your primary weapon. Unfortunatly, Treyarch nerfed two parts of this perk. The first main inconvience is the fact that you can use certian weapon attachment combos. For example guns with Masketry, Flamethrower, and M205 or GP25 Grenade Launcher, can not use a silencer attachment. Warlord Pro was the second part of this perk that was nerfed. While it is an interesting way to play it is not as cool as Bling Pro was. With Warlord Pro you get two leathal equipments and two tactical exlcuding willy petes.
Scout: Soon to come.